EP0031931B1 - Cartouche de film photographique pourvu de moyen étanche à la lumière et jouant le rôle de plaque de pression - Google Patents

Cartouche de film photographique pourvu de moyen étanche à la lumière et jouant le rôle de plaque de pression Download PDF

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Publication number
EP0031931B1
EP0031931B1 EP19800107954 EP80107954A EP0031931B1 EP 0031931 B1 EP0031931 B1 EP 0031931B1 EP 19800107954 EP19800107954 EP 19800107954 EP 80107954 A EP80107954 A EP 80107954A EP 0031931 B1 EP0031931 B1 EP 0031931B1
Authority
EP
European Patent Office
Prior art keywords
cartridge assembly
pressure applying
opening
applying means
rear wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19800107954
Other languages
German (de)
English (en)
Other versions
EP0031931A1 (fr
Inventor
Gurdip S. Sethi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US06/118,272 external-priority patent/US4268145A/en
Priority claimed from US06/161,792 external-priority patent/US4309096A/en
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of EP0031931A1 publication Critical patent/EP0031931A1/fr
Application granted granted Critical
Publication of EP0031931B1 publication Critical patent/EP0031931B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/26—Holders for containing light sensitive material and adapted to be inserted within the camera

Definitions

  • This invention relates to a photographic film cartridge assembly
  • a photographic film cartridge assembly comprising a disk of photographic film, a casing enclosing the disk and having front and rear opaque walls, said front wall having an exposure window and said rear wall having an opening opposite said exposure window, a light sealing and pressure applying means within the casing which includes (a) a rigid portion movable into contact with the film to urge the film toward the exposure window when an external force is applied using the opening, and (b) a light sealing portion which prevents light from entering said casing through said opening, retaining means restricting movement of the light sealing and pressure applying means with respect to the rear wall.
  • DE-OS 28 09 856 discloses a film cartridge assembly having front and rear walls between which a disk of photographic film is rotatable to align image areas of the film with an exposure window in the front wall.
  • the front and rear walls are formed of a rigid material to protect the film from reasonably expected rough handling.
  • the exposure window in the front wall is large enough to provide access to the film for a camera film support surface.
  • the rear wall has an opening opposite the exposure window which opening is covered by an opaque flexible membrane.
  • Fig. 18 of DE-OS 28 09 856 shows pressure applying and permanent light sealing means in the form of a rigid insert supported by the flexible membrane.
  • the insert is movable into contact with the film to urge the film toward the exposure window when an external force is applied using the opening.
  • the force is applied by a camera to hold the film flat against the camera film support surface during exposure. The force is relieved for film advance.
  • the flexible membrane performs the multiple function of flexibly holding the pressure applying means so it can be moved toward the film, of restricting movement of the pressure applying means with respect to the rear wall and of blocking light both before and after the external force is removed.
  • the rigid portion of said light sealing and pressure applying means is located between the rear wall and the disk, and covers the entire area of the opening and an area extending beyond its edges in all directions, and in that said light sealing portion comprises cooperating baffle structures on both said rear wall and said rigid portion to form a tortuous light path preventing light from the opening from reaching the film both before such an external force is applied and after it has been removed.
  • the membrane can be eliminated, which allows greater freedom of movement of the light sealing and pressure applying means, which, in turn, allows the rigid portion to lie flatter against the film. It is also less expensive to manufacture than structures in which the rigid member is supported by the membrane.
  • the cooperating baffle structures may take the form of a rib on the rear wall extending into a recess on the pressure applying means, the recess and rib surrounding the opening.
  • the light path may be made more tortuous by making the opening in the rear wall substantially smaller than prior art openings.
  • a protrusion can be formed in the pressure applying means extending into the opening to assure reliability in camera interface.
  • the light-sealing and pressure applying means may be relatively rigid throughout and therefore movable as a unit toward the film.
  • movement of the rigid portion is most unrestricted if the rigid portion is supported by flexible legs fixed to the rear wall at their extremities.
  • the present invention is an improvement of the cartridge assembly described in aforementioned DE-OS 28 09 856. Any structure not shown herein may take the form shown in that application.
  • a still-picture camera 1 which is similar in certain respects to the camera disclosed in European Patent Application 80102036.3 entitled Pressure Member Urging Mechanism filed on April 16, 1980 and published on October 29, 1980 as EP-A-17971.
  • the camera front shown in Fig. 1 includes a picture-taking lens 3, a viewfinder 5, a shutter release button 7 movable along a slot 9, and a manual tab 11 movable along an arcuate slot 13.
  • a locking tab 15 at one side of camera 1 is movable along a slot 17 to disengage from an internal latch 19 (Fig. 2) located on a rear door 21 of the camera, whereupon the rear door may be opened for loading a film cartridge assembly 23 into a receiving chamber 25 of the camera.
  • a pin 27 coupled to movable tab 11 and extending from an arcuate slot 29, engages cover member drive lugs 31 (Fig. 3) in the cartridge assembly.
  • the cartridge assembly of Figs. 2-4 includes front and rear opposed walls 41 and 43, respectively, joined together at one edge by a hinge 44 (Fig. 4).
  • the terms "front” and “rear” are used in this specification and appendant claims with reference to the orientation of the cartridge assembly during actual use of the apparatus described. That is, the front of the cartridge would face along the camera's optical axis in a direction toward the taking lens.
  • a film unit 40 Disposed between opposed walls 41 and 43 is a film unit 40, which includes central core 37 and a film disk 45 similar to that described in the aforementioned DE-OS 28 09 856.
  • Film disk 45 comprises a moderately flexible but self-supporting base sheet formed of, for example, cellulose acetate or poly(ethylene terephthalate).
  • the base sheet carries photosensitive elements on one face thereof, thus providing a photographic imaging surface on which a latent photographic image can be recorded and subsequently photographically developed.
  • An opaque cover member 47 is rotatably carried on front wall 41 so that its fan-shaped leaf portion 49 can be moved into and out of alignment with an exposure window 51 in that casing wall.
  • the passage of light rays through exposure window 51 and onto photosensitive film disk 45 when the cartridge assembly is not protectively encased by a camera is precluded by means of a leaf portion 49 and a separator layer 53.
  • Separator layer 53 is formed of an opaque sheet material and has a framing window 55 aligned with exposure window 51 in casing wall 41.
  • a second, flexible abutment 56 and a ramped tooth 58 have been added to form a detenting function to inhibit opening of cover member 47' even if the primary latch of abutment 57' and tooth 59' fail.
  • the detent is not a lock and is overcome by a modest amount of torque on the cover member, but it provides sufficient restraint to reduce the chance of inadvertent opening movement of the cover member.
  • the cover member 47 or 47' is shown mounted for rotation about the same axis as the film unit 40. However, the cover member can be mounted to rotate about an axis displaced toward the exposure window 51 from the film unit axis. This construction saves space in the cartridge because the cover member will not extend as far from either axis in its uncovering position.
  • the camera includes a metering pawl, not shown, which extends through exposure window 51 to engage peripheral film disk notches 105 (two or which are shown in Fig. 4).
  • the metering pawl must be removed from window 51 to allow the cover member 47 (or 47') to move to its covering position. Although this can be accomplished by shaping the pawl such that it is cammed out of the way by the cover member itself, this solution requires substantial force and can cause jams.
  • a better approach is to provide a cam or lever structure connecting the pawl and pin 27, removing the pawl whenever pin 27 begins to close the cover member and returning it into engagement with the film disk whenever pin 27 has fully opened the cover member.
  • pin 27 can be functionally connected to spline 33 or its drive mechanism to open the cover member in response to the first advancement of film unit 40, with closing of the cover member being accomplished by locking tab 15.
  • Control of the metering pawl for cover member movement can be effected directly by any of these related structures through mechanical designs obvious to those skilled in the art.
  • Rear wall 43 of cartridge assembly 23 has a circular opening 65, opposite exposure window 51 (Fig. 5).
  • An opaque, rigid pressure plate 67 serving as light-sealing and pressure-applying means is received between the rear wall and film disk 45 and is movable toward and away from the exposure window 51.
  • the pressure plate in bearing against the rear surface of the film disk, presses the film disk into contact with a rectangular film support surface 69, projecting from the camera chamber 25 into exposure window 51. Through this interaction, an exposure area of film disk 45 is held substantially flat in an exposure plane coincident with the focal plane of picture-taking lens 3.
  • Pressure plate 67 and the adjacent surface of rear wall 43 are shown enlarged in Fig. 6 as they appear before assembly.
  • the pressure plate preferably has a generally square configuration with a pair of oppositely extending legs 91 and 93.
  • Rear wall 43 has a cavity 95 shaped to receive the pressure plate.
  • the cavity may be a recess in the inner surface of the casing part or it may be formed by a raised rib as shown in Fig. 6.
  • Leg 91 has a dimension which is less than the corresponding dimension of leg 93. In the preferred embodiment, that dimension is the width of the leg.
  • the mating portions of cavity 95 correspond to the different dimensions so that pressure plate 67 can be placed into the cavity in only one orientation during assembly.
  • a plurality of stake posts 97 are provided on rear wall 43 adjacent to the leg portions of cavity 95. After pressure plate 67 is inserted into the cavity, posts 97 are partially melted by high frequency vibratory energy to hold the pressure plate in the cavity.
  • an inwardly projecting ridge could be provided around at least a portion of the periphery of cavity 95 so that pressure plate 67 would have a snap-fit in the cavity 95.
  • Pressure plate 67 has a raised surface 99 which is aligned with, and conforms generally to the shape of, rectangular film support surface 69 when the cartridge assembly is loaded into a camera.
  • a center extension 101 extends into opening 65 in rear wall 43 so as to be presented to camera mechanism for urging the pressure plate against film disk 45.
  • An annular rib 103 extends into the cartridge assembly cavity around opening 65 so as to form, with a recess 98 in pressure plate 67, a tortuous light path or baffle to prevent light entering the cartridge casing through opening 65 from reaching film disk 45 around the pressure plate.
  • An additional rib 96 surrounding the pressure plate contributes to the tortuous path.
  • the rear surface of the pressure plate may be black to inhibit the reflection of such light.
  • One corner of raised surface 99 is recessed so that the camera's metering pawl may enter the cartridge assembly through exposure window 51 and engage film disk 45 in one of the disk's peripheral notches 105 without contacting pressure plate 67 on the rear side of the film disk.
  • Loading door 21 of camera 1 includes a recess or relieved area 71 which defines a storage plane for a pressure plate urging member 73.
  • the pressure plate urging member is preferably a substantially flat strip of resiliently flexible material, such as poly-(ethyleneterephthalate) and includes a tongue 75.
  • the tongue has a forward or leading end 77 which abuts a stop 79, fixed to loading door 21 in recess 71.
  • a constraining plate 83 having one opening 85 from which stop 81 protrudes and another opening 87 through which the bowed portion of tongue 75 protrudes, is secured to loading door 21, over pressure plate urging member 73.
  • constraining plate 83 maintains the pressure plate urging member in the storage plane, except for bowed portion 80 of tongue 75 which moves through opening 87 in the constraining plate.
  • bowed portion 80 of tongue 75 applies a force to pressure plate 67 which is thereby moved against film disk 45 to press the film disk into contact with camera film support surface 69, projecting into exposure window 51 of the film cartridge assembly. Whereupon, the film disk 45 is held substantially flat in the focal plane of picture-taking lens 3 for exposure.
  • Figs. 9 and 10 show an alternative embodiment of the pressure plate, referred to by numeral 67' and having rigid central portion in the form of a raised surface 99' with a center extension 101' similar to those of the first embodiment pressure plate 67.
  • a pair of flexible extending legs 91' and 93' have holes 107 and 109, respectively, which align with thermoplastic posts 111 and 113 on the rear wall.
  • the legs 91' and 93' can be made flexible while the central portion is rigid by molding techniques well known in the art, for example, by molding the legs thinner than the rigid central portion or by molding hinges in the legs.
  • the central portion will be relatively rigid while the long flat legs 91' and 93' will be relatively flexible even though the entire pressure plate 67' is substantially the same thickness.
  • posts 111 and 113 are deformed, as by an ultrasonic horn, over the top of legs 91' and 93' to retain the plate.
  • a rib 115 extends into the recess below raised surface 99' to form a baffle structure which contributes to the tortuous light path.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Details Of Cameras Including Film Mechanisms (AREA)

Claims (7)

1. Chargeur pour film photographique comprenant:
- un disque (45) de pellicule photographique,
- étui emprisonnant le disque et présentant des parois opaques antérieure (41) et postérieure (43) où cette paroi antérieure (41) est percée d'une fenêtre d'exposition (51) et cette paroi postérieure (43) est percée d'un regard (65) à l'opposé de cette fenêtre d'exposition (51),
-des moyens d'étanchéité à la lumière et presseur (67; 67') dans l'étui qui sont munis (a) d'une partie rigide (99, 99') mobile pour venir au contact du film afin de pousser ce dernier vers la fenêtre d'exposition (51) quand une force extérieure est appliqué par l'entremise du regard, et (b) d'une partie assurant l'étanchéité à la lumière interdit à la lumière de pénétrer dans l'étui par le regard,
- des moyens de retenue (97, 111, 113) entravant le déplacement des moyens d'étanchéité à la lumière et presseur (67, 67') par rapport à la paroi postérieure (43), caractérisé en ce que la partie rigide (99, 99') de ces moyens d'étanchéité à la lumière et presseur est disposée entre la paroi postérieure (43) et le disque (45), et couvre la totalité de la surface du regard (65) et une zone s'étendant au-delà de ses bords dans toutes les directions, et en ce que la partie assurant l'étanchéité à la lumière comprend des structures écran coopérantes (103, 98, 96, 103', 115) à la fois sur la paroi postérieure (43) et la partie rigide (99, 99') pour former une chicane empêchant la lumière venant du regard (65) d'atteindre le film aussi bien avant l'application d'une telle force extérieure qu'après sa neutralisation.
2. Chargeur pour film photographique conforme à la revendication 1, où ces structures- écran comprennent un embrèvement (98) sur la face des moyens d'étanchéité à la lumière et presseur (67) en regard de la paroi postérieure (43) du chargeur et une collerette (103, 115) sur la paroi postérieure (43) entourant le regard (65) et s'étendant dans cet embrèvement (98).
3. Chargeur pour film photographique conforme à la revendication 1 ou 2 dans lequel les moyens d'étanchéité à la lumière et presseur (67, 67') comprennent une partie (101, 101') qui s'engage dans le regard (65) de la paroi postérieure (43) de manière qu'un organe de sollicitation (73) d'un appareil (1) puisse venir à son contact lorsqu'un chargeur (23) a été placé dans ce dernier.
4. Chargeur pour film photographique conforme à l'une quelconque des revendications 1-3 où la partie rigide comprend une surface en forme de cadre rectangulaire en saillie (99, 99') en regard de la fenêtre d'exposition (51 ) et placée pour être à l'aplomb d'une surface d'appui (69) du film d'un appareil (1) garni du chargeur (23).
5. Chargeur pour film photographique conforme à la revendication 4 dans la mesure où elle dépend de la revendication 2 où la surface en saillie (99, 99') est exactement en face de l'embrèvement (98).
6. Chargeur pour film photographique conforme à l'une quelconque des revendications 1-5 où la totalité des moyens d'étanchéité à la lumière et presseur (67) sont rigides et mobiles en direction du film photographique.
7. Chargeur pour film photographique conforme à l'une quelconque des revendications. 1-6 où les moyens d'étanchéité à la lumière et presseur (67') comprennent deux pattes (91', 93') venues de moulage d'un bloc et ces moyens de retenue (111, 113) sont fixés à l'extrémité de ces pattes (91', 93') et où ces pattes (91', 93') sont flexibles pour permettre le déplacement de la partie rigide (99') en direction de la fenêtre d'exposition (51
EP19800107954 1979-12-26 1980-12-17 Cartouche de film photographique pourvu de moyen étanche à la lumière et jouant le rôle de plaque de pression Expired EP0031931B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US10663079A 1979-12-26 1979-12-26
US106630 1979-12-26
US118272 1980-02-04
US06/118,272 US4268145A (en) 1980-02-04 1980-02-04 Film cartridge assembly
US06/161,792 US4309096A (en) 1979-12-26 1980-06-23 Film cartridge assembly with pressure plate
US161792 1988-02-29

Publications (2)

Publication Number Publication Date
EP0031931A1 EP0031931A1 (fr) 1981-07-15
EP0031931B1 true EP0031931B1 (fr) 1984-03-21

Family

ID=27380161

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800107954 Expired EP0031931B1 (fr) 1979-12-26 1980-12-17 Cartouche de film photographique pourvu de moyen étanche à la lumière et jouant le rôle de plaque de pression

Country Status (4)

Country Link
EP (1) EP0031931B1 (fr)
DE (1) DE3067217D1 (fr)
HK (1) HK98184A (fr)
SG (1) SG49484G (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR7801359A (pt) * 1977-03-07 1978-09-26 Eastman Kodak Co Unidade de filme fotografico,conjunto de cartucho de filme fotografico laminar fino,e camara para receber uma unidade de filme
US4194822A (en) * 1978-08-04 1980-03-25 Eastman Kodak Company Photographic film cartridge assembly and camera

Also Published As

Publication number Publication date
EP0031931A1 (fr) 1981-07-15
HK98184A (en) 1984-12-28
DE3067217D1 (en) 1984-04-26
SG49484G (en) 1985-03-29

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